Hairpin clip
reusable type of formed wire used on a grooved shaft, designed to be easily installed and uninstalled
en-US/ˈhɛɹˌpɪn ˈklɪp/
en-GB/ˈhɛəpɪn ˈklɪp/
reusable type of formed wire used on a grooved shaft, designed to be easily installed and uninstalled